The first full standard specification for mineral wagons was issued by the RCH in 1887. This laid down the minimum standards for all aspects of wagon design, materials and construction which, following the inspection and acceptance of the wagon by one company, all the member companies agreed to accept for regular use.

A new detailed model of a 9 plank sided covered salt van with peaked wood roof based on RCH 1887 design specifications.This new design add to the range and specification of O gauge ready to run wagons, featuring a diecast chassis for added weight and compensation beams for smooth running.British Manufacturing. Dapol plan to be producing these models from their factory unit in Chirk.

Salt required weather protection to prevent loss and damage, so special wagons were built with a simple peak roof added to a body following the design of a standard open wagon. This wagon was operated by Stubbs and Company of Stafford.